Open-hearth furnace



March 2 1926.

J; D. JONES ET AL OPEN HEARTH FURNACE 4 Sheets-Sheet 1 Filed April 231921 March 2,1926. 1,575,060 J. D JONES ET AL OPEN HEARTH FURNACE FiledApril 23, 1921 4 sheets-Sheet 2 March 2 1926.

- J. D. JON-ES ET AL OPEN HEARTH FURNACE Filed April 23, 1921 4Sheets-Sheet :3

March 2 1926.

1,575,060 J. D. JONES ET AL 4 OPEN HEARTH FURNACE Filed April 1921 4Sheets-Sheet 4 v r I r Patented Mar. 2, 1926.

UNITED STATES PATENT OFFICE.

JAMES DYER JONES, OF SAUL'I. STE. MARIE, ONTARIO, CANADA, AND EARL EWINGLITZ, OF SAULT STE. MARIE, MICHIGAN.

OPEN-HEARTH FURNACE.

Application filed April 23, 1921. Serial No. 463,856.

To all whom it may concern: Be it known that We, JAMES DYER JONES,

' a citizen of the United States, and residing at the city of Sault Ste.Marie, in the Province of Ontario and Dominion of Canada, and EARL EWINGLITZ, a citizen of the United States, and residing at the city of SaultSte. Marie, in the State of Michigan, United States of America, haveinvented certain new and useful Improvements in OpenHearth Furnaces, ofwhich the following is a specification.

This invention relates to improvements in open-hearth furnaces for themanufacture of steel, and other metallic products, and the objects ofthe invention are to effect a greater economy in the operation of thefurnace, to utilize the heat of the waste gases in heating the i'ngoingair, and also the fuel, if necessary, without losing any time inreversing as is the case in present known furnaces, to lessen theexpense of repair, to eliminate delays in operation, to obtain a maximumamount of output from the furnace, and to enable the various operationsto be performed continuously; and it consists essentially of the featureof having separate ports used respectively for the supply of thecombustible combination of fuel and air exclusively and the escape ofthe waste gases exclusively, and of the other features hereinafterdescribed in detail in the accompanying specification and drawings.

In the drawings:

Figure 1 is an elevation of an open-hearth furnace embodying a suggestedconstruction for putting into effect the present invention.

Figure 2 is a vertical sectional view through the same.

Figure 3, is a sectional plan view on the line ww, Figure 1.

Figure 4.- is a fragmentary sectional view, showing the conductingthroat or flue moved to one side to permit charging of the furnace.

Figure 5 is a sectional view on the line, y z Figure f.

Figure 6 is a sectional view taken at right angles to Figure 2 andshowing one of the heating burners.

In the drawings like characters of reference indicate correspondingparts in all the figures.

Referring to the drawings:

A indicates the furnace proper, having therein the hearth or crucible Bconstructed of suitable refractory material in accordance with thepractice in the art. The furnace is provided with a suitable taphole 10leading to a spout 11 which may discharge into the bucket C supported bya travelling crane, or other similar device, and with a slag tap hole10.

The furnace is provided at suitable points around its periphery withfuel and air ports 12, each having a burner D therein adapted to combinefor burning suitable fuel such as gas, powdered coal, oil, or the like,with pre-heated air, both under pressure preferably but not necessarily,such as to maintain a higher pressure inside the furnace than theoutside atmospheric pressure. The construction of the burners of thistype does not form part of the present invention nor does thecombination, within the burners, of the fuel and the air form part ofthe present invention. The burners are supplied with heated air from aconduit 13 leading from a manifold 14; which extends around theregenerative stove E and is operatively con nected thereto in the mannerhereinafter described.

The regenerative stove in this particular construction islocatedimmediately above the furnace A but may be conveniently locatedelsewhere, but in such away that the products of combustion may passthrough the stove from the furnace, said products passing in thisparticular construction from the furnace to the stove through a throator fine F which is made removable in order to permit charging of thefurnace. it will be seen that the throat F is frustro-conical in shapeand when in normal position (as in Figure 2) is located immediatelyabove the opening 15 in the roof 16 of the furnace.

The stove E is supported by suitable standards 17 leading from theframe-work 18 extending around the furnace A. The stove E may be of anyconvenient or wellknown design and may be of the design which we haveillustrated. The gases arising from the throat F are designed to passinto the bottom of the stove and to pass through suitable passageways 19to the chimney G. The passageways 19 are formed in conduits 20 in thestove, which conduits extend through the heating chamber 21 of thestove. The air is caused to take a circuitous path through the heatingchamber 21 by means of staggered baflie plates 22, the inlet 23 for theair being located at the upper end wall, the outlet port 24 is at thelower end and is connected to a manifold 14.

The air to be regenerated will pass through the heating chamber 21 andbe hea ed by the heat from the conduits 20 before passing into themanifold 14 from whence it passes into the burner D. The movement of theair is effected by suitable blowers or compression apparatuses notforming part of the present invention and not illustrated herein. Inaddition to the openings 12, the furnace is provided with one or moreopening 25 having a suitable external door 26 of any convenient designand adapted to permit access to the interior of the furnace for anypurpose desired. The fuel may be supplied to the burner D from suitablesup ply pipes 27 through which the fuel may be forced under pressure. 7

In order to permit charging of the furnace, the throat is mounted onrollers 28 which run on tracks 29 and is adapted to be moved inwardlyand outwardly by suitable mechanical means, such as fluid pressurecylinder 30, having a suitable piston with a piston rod 31 operativelyconnected to the throat F in a manner well known in the art.

When it is desired to charge the furnace, the throat is retracted to theposition shown in full lines in Figure 4 and in dotted lines in Figure1, and the material to be treated may then be dumped through the opening15 from suitable charging truck H, or other device.

In operation, if the material to be melted is placed in the furnace, thefuel such as gas, powdered coal, oil, or other suitable substance, isforced under pressure through the burner D, in which burner it iscombined with pre-heated air forced under pressure, the pressure beingpreferably, but not necessarily, such as to maintain a higher pressureinside the furnace than the outside atmospheric pressure.

The chimney Gr carries off the products of combustion, or waste gases,through the stove E, where the greater part of their sensible heat isimparted into the fines 20, which act as regenerators, and which impartthe heat, in turn, to the ingoing air, thus pre-heatin the air beforecombining with the fuel.

Any required observation of the bath is permitted by the doors 26 whichalso permit the supply of any additional material to the bath, andpermit repairing of the furnace between charges.

It will be seen that, owing to the supply ports and discharge portsbeing exclusive and not interchangeable, and at the same time utilizingthe heat of the waste gases to heat the ingoing air the delaysconsequent on reversing the supply of fuel and air into the furnace isdone away with, thereby appreciably shortening the period of time withinwhich maximum heat is reached, and permitting continuous maintenance ofmaximum heat, resulting in greater relative product and economy inoperation.

It will be observed that the fuel and air ports 12 are positioned atintervals around the periphery of the furnace and being operatedsimultaneously will produce flames projecting from the side towards thecentre of the furnace and impinge on the bath, thus effectuallymaintaining the surface thereof at a high temperature.

As many changes could be made in the above construction, and manyapparently widely different embodiments of our invention within thescope of the claims, constructed without departing from the spirit orscope thereof, it is intended that all matter contained in theaccompanying specification and drawings shall be interpreted asillustrative and not in a limiting sense.

What we claim as our invention is:

1. In an apparatus of the character described, the combination with afurnace, of a regenerative stove and a removable throat offrusto-conical formation adapted to form a connection between thefurnace and the regenerative stove, and designed exclusively for wastegases.

2. In an apparatus of the character described, a furnace having a portopening for the products of combustion, a regenerative stove, tracksmounted between the regenerative stove and the furnace, a removablethroat exclusively for waste gases on said tracks and adapted to form aconnection between the furnace and the regenerative stove, a pluralityof separated fuel burners operatively connected to the furnace, andadapted to simultaneously inject fuel with compressed air into thefurnace.

3. The combination with an open hearth furnace, containing a pluralityof separated ports used simultaneously and exclusively for the admissionof fuel or air or fuel and air combined, and an outlet flue usedexclusively for the waste gases, of a regenerative stove and a removablethroat designed exclusively for waste gases and adapted to form aconnection between the furnace and the regenerative stove.

In witness whereof we have hereunto set our hands.

JAMES DYER JONES. EARL EWING LITZ.

